Asymmetric alkylation of N-acylsultams: A general route to enantiomerically pure, crystalline C(α,α)-disubstituted carboxylic acid derivatives
Wolfgang Oppolzer, Robert Moretti and Silvia Thomi
Tetrahedron Letters
Volume 30, Issue 41, 1989, Pages 5603-5606
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http://dx.doi.org/10.1016/S0040-4039(01)93810-9